verizon. >>> for years, michael shannon kept a calendar counting each day apart from his boys. he kept track of all the missed birthdays and skipped holidays. for his oldest son, mike, from a first marriage, that calendar was a signature part of his growing up. >> for a long time, i remember every single day was circled with a number on it. i think one was how many days they had been gone and one may have been how many days since we last had contact with them. and pretty soon, numbers were on top of numbers. i don't think any of us -- at that point, none of us could have ever imagined, maybe even a year later, i probably would have told you within the next year, they would have come back. and then even five years later, i would have told you, any day now they're going to come back. i never in my wildest dreams thought it was going to last this long. >> mike shannon is still searching for his younger half brothers online, holding onto hope that they can be a family once again. >> it's very difficult to pick up where you left off because the last thing i saw was a 5-year-old boy.